Just like in the other post you just made. Your motor is proven to handle well over 500whp and 500wtq. Swapping to BOTH of these with a good Air to Air kit will still keep you out of the danger zone power levels but make big, safe power.
If its not in the budget to do both, then the 9psi pulley is a lot cheaper then the trim upgrade. BTW. I wouldnt even look at 928. Just send it in to the guys that acually make that supercharger and for the same price upgrade from the SC trim to the Si trim that makes 2psi more while spinning the supercharger the same speed.
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